pm2

- java iterator

content/Java/Java.md

@@ -6,10 +6,28 @@ Author Profile:
 tags:
   - java
 Creation Date: 2023-07-20T21:02:30+08:00
-Last Date: 2023-12-15T23:31:58+08:00
+Last Date: 2024-06-29T17:05:51+08:00
 References: 
 ---
 ## Abstract
-- Strongly typed with [[Static Typing]]
-- [[OOP]]
-- [[Functional Programming]] (not very elegant)
+---
+- A [[OOP]] language that is[[Datatype#Statically Typed]] & [[Datatype#Strongly Typed]]. It also provides a [[Function|functional]] interface but it isn't very elegant
+
+
+
+
+## Java Iterator
+---
+- An [[OOP#OOP Object]] of the `java.util.Iterator` [[OOP#OOP Class]] that can be used to **loop through collections** like `ArrayList` and `HashSet`
+
+>[!code] Obtaining a Java Iterator
+> `Iterator<T> it = cars.iterator();`, where `cars` is an instance of Java collections.
+
+>[!code] Get the first element of a collection using Java iterator
+>`it.next();` returns the first element of a collection, where `it` is a Java iterator.
+
+>[!code] Loop through a collection using Java iterator
+> `while(it.hasNext()) {System.out.println(it.next());}`, where `it` is a Java iterator.
+
+>[!code] Remove an element from a collection using Java iterator
+> `it.remove();`, where `it` is a Java iterator.